Rockwell / Allen-Bradley 1746-P2 SLC 500 Power Supply

The Rockwell Allen-Bradley 1746-P2 is a chassis-mount power supply for SLC 500 programmable logic controller systems. It delivers regulated 5 VDC and 24 VDC outputs to backplane modules and accepts user-supplied 24 VDC input, with integrated status LEDs for operational indication. The unit mounts directly within a 1746 SLC 500 chassis and maintains CPU operation during brief power interruptions through integrated hold-up circuitry.

Technical Specifications

• Input voltage: 85–132 VAC or 170–265 VAC (selectable via jumper)


• Nominal input: 120/220 VAC


• Input frequency: 47–63 Hz


• Typical line power: 180 VA


• Maximum inrush current: 20 A Output Power


• 5 VDC backplane output: 5 A


• 24 VDC backplane output: 0.96 A


• User-supplied 24 VDC input: 18–30 VDC range, 200 mA capacity


• Total output power limit: 70 W (combined across all outputs)


• Maximum user-supplied overcurrent protection: 15 A Electrical Protection


• Input/backplane isolation: 1800 V AC RMS for 1 second


• Fuse protection: 250 V, 3 A (e.g., BUSSMANN AGC 3)


• CPU hold-up time: 20 ms to 3 seconds (load dependent) Physical & Environmental


• Dimensions: 74 × 140 × 145 mm (5.5 × 2.9 × 5.7 inches)


• Weight: 1.1 kg (2.5 lbs)


• Operating temperature: 0°C to 60°C


• Storage temperature: −40°C to 85°C


• Relative humidity: Maximum 95% RH (non-condensing)

Key Features

• Dual input voltage selection via jumper terminal


• Open-style design for 1746 chassis integration


• Status LED indication for power and fault monitoring


• Integrated hold-up circuitry maintains operation during transient power loss


• Short-circuit and overcurrent fuse protection


• Isolated user 24 VDC power input with independent current limiting

Compatibility & Integration The 1746-P2 is designed exclusively for installation in a 1746 SLC 500 chassis. It meets CCC, CE, GOST, KC, and MARINE standards. For Series C and later modules, monitoring the 24 VDC user output with a dedicated 24 VDC input channel is recommended to prevent unexpected operation during user power shutdown.